Audio system accessory



FIG. 1 is a perspective view of an audio system accessory as seen from the front, top and side;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for an audio system accessory, substantially as shown and described. 